ale/autoload/ale/cursor.vim

scriptencoding utf-8
" Author: w0rp <devw0rp@gmail.com>
" Author: João Paulo S. de Souza <joao.paulo.silvasouza@hotmail.com>
" Description: Echoes lint message for the current line, if any

" Controls the milliseconds delay before echoing a message.
let g:ale_echo_delay = get(g:, 'ale_echo_delay', 10)
" A string format for the echoed message.
let g:ale_echo_msg_format = get(g:, 'ale_echo_msg_format', '%code: %%s')

let s:cursor_timer = -1

" A wrapper for echon so we can test messages we echo in Vader tests.
function! ale#cursor#Echom(message) abort
    if mode() is# 'n'
        " no-custom-checks
        exec "norm! :echom a:message\n"
    endif
endfunction

function! ale#cursor#TruncatedEcho(original_message) abort
    let l:message = a:original_message
    " Change tabs to spaces.
    let l:message = substitute(l:message, "\t", ' ', 'g')
    " Remove any newlines in the message.
    let l:message = substitute(l:message, "\n", ' ', 'g')
    " Convert indentation groups into single spaces for better legibility when
    " put on a single line
    let l:message = substitute(l:message, ' \+', ' ', 'g')

    " We need to remember the setting for shortmess and reset it again.
    let l:shortmess_options = &l:shortmess

    try
        let l:cursor_position = getpos('.')

        " The message is truncated and saved to the history.
        silent! setlocal shortmess+=T

        try
            call ale#cursor#Echom(l:message)
        catch /^Vim\%((\a\+)\)\=:E523/
            " Fallback into manual truncate (#1987)
            let l:winwidth = winwidth(0)

            if l:winwidth < strdisplaywidth(l:message)
                " Truncate message longer than window width with trailing '...'
                let l:message = l:message[:l:winwidth - 4] . '...'
            endif

            exec 'echomsg l:message'
        catch /E481/
            " Do nothing if running from a visual selection.
        endtry

        " Reset the cursor position if we moved off the end of the line.
        " Using :norm and :echomsg can move the cursor off the end of the
        " line.
        if l:cursor_position != getpos('.')
            call setpos('.', l:cursor_position)
        endif
    finally
        let &l:shortmess = l:shortmess_options
    endtry
endfunction

function! s:StopCursorTimer() abort
    if s:cursor_timer != -1
        call timer_stop(s:cursor_timer)
        let s:cursor_timer = -1
    endif
endfunction

function! ale#cursor#EchoCursorWarning(...) abort
    let l:buffer = bufnr('')

    if !g:ale_echo_cursor && !g:ale_cursor_detail
        return
    endif

    " Only echo the warnings in normal mode, otherwise we will get problems.
    if mode(1) isnot# 'n'
        return
    endif

    if ale#ShouldDoNothing(l:buffer)
        return
    endif

    let [l:info, l:loc] = ale#util#FindItemAtCursor(l:buffer)

    if g:ale_echo_cursor
        if !empty(l:loc)
            let l:format = ale#Var(l:buffer, 'echo_msg_format')
            let l:msg = ale#GetLocItemMessage(l:loc, l:format)

            call ale#cursor#TruncatedEcho(l:msg)
            let l:info.echoed = 1
        elseif get(l:info, 'echoed')
            " We'll only clear the echoed message when moving off errors once,
            " so we don't continually clear the echo line.
            "
            " no-custom-checks
            echo
            let l:info.echoed = 0
        endif
    endif

    if g:ale_cursor_detail
        if !empty(l:loc)
            call s:ShowCursorDetailForItem(l:loc, {'stay_here': 1})
        else
            call ale#preview#CloseIfTypeMatches('ale-preview')
        endif
    endif
endfunction

function! ale#cursor#EchoCursorWarningWithDelay() abort
    let l:buffer = bufnr('')

    if !g:ale_echo_cursor && !g:ale_cursor_detail
        return
    endif

    " Only echo the warnings in normal mode, otherwise we will get problems.
    if mode(1) isnot# 'n'
        return
    endif

    call s:StopCursorTimer()

    let l:pos = getpos('.')[0:2]

    if !exists('w:last_pos')
        let w:last_pos = [0, 0, 0]
    endif

    " Check the current buffer, line, and column number against the last
    " recorded position. If the position has actually changed, *then*
    " we should echo something. Otherwise we can end up doing processing
    " the echo message far too frequently.
    if l:pos != w:last_pos
        let l:delay = ale#Var(l:buffer, 'echo_delay')

        let w:last_pos = l:pos
        let s:cursor_timer = timer_start(
        \   l:delay,
        \   function('ale#cursor#EchoCursorWarning')
        \)
    endif
endfunction

function! s:ShowCursorDetailForItem(loc, options) abort
    let l:stay_here = get(a:options, 'stay_here', 0)

    let s:last_detailed_line = line('.')
    let l:message = get(a:loc, 'detail', a:loc.text)
    let l:lines = split(l:message, "\n")

    if g:ale_floating_preview || g:ale_detail_to_floating_preview
        call ale#floating_preview#Show(l:lines)
    else
        call ale#preview#Show(l:lines, {'stay_here': l:stay_here})

        " Clear the echo message if we manually displayed details.
        if !l:stay_here
            " no-custom-checks
            echo
        endif
    endif
endfunction

function! ale#cursor#ShowCursorDetail() abort
    let l:buffer = bufnr('')

    " Only echo the warnings in normal mode, otherwise we will get problems.
    if mode() isnot# 'n'
        return
    endif

    if ale#ShouldDoNothing(l:buffer)
        return
    endif

    call s:StopCursorTimer()

    let [l:info, l:loc] = ale#util#FindItemAtCursor(l:buffer)

    if !empty(l:loc)
        call s:ShowCursorDetailForItem(l:loc, {'stay_here': 0})
    endif
endfunction